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Neodymium-iron-boron magnet nickel electroplating solution and use method thereof

A neodymium iron boron and nickel electroplating technology, applied in electrolytic coatings, coatings, etc., can solve the problems of high porosity and uneven thickness distribution of electroplated nickel layer, and achieve the effect of low porosity, good uniformity and fine crystallization

Active Publication Date: 2013-03-20
浙江东阳东磁有限公司
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0006] The purpose of the present invention is to overcome the defects of uneven thickness distribution and high porosity of the electroplating nickel layer of the existing NdFeB magnets, and provide a nickel electroplating solution for the NdFeB magnets. The obtained electroplating nickel layer has a uniform thickness distribution and relatively high porosity Low, improve the corrosion resistance of NdFeB magnets

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0033] Plating solution formula:

[0034] NiSO 4 ·6H 2 o 350g / L NiCl 2 ·6H 2 o 80g / L h 3 BO 3 55g / L Yttrium sulfate 4g / L Nano silica 2g / L

[0035] Electroplating process parameters: anode: metal nickel; cathode: NdFeB magnet; stirring: air stirring; pH5.5; cathode current density: 6A / dm 2 ; Temperature: 60°C; Electroplating time: 10 minutes.

Embodiment 2

[0037] Plating solution formula:

[0038] NiSO 4 ·6H 2 o 300g / L NiCl 2 ·6H 2 o 60g / L h 3 BO 3 55g / L Yttrium sulfate 2g / L Nano silica 2g / L

[0039] Electroplating process parameters: anode: metal nickel; cathode: NdFeB magnet; stirring: cathode movement; pH5.0; cathode current density: 4A / dm 2 ; Temperature: 55°C; Electroplating time: 15 minutes.

Embodiment 3

[0041] Plating solution formula:

[0042] NiSO 4 ·6H 2 o 280g / L NiCl 2 ·6H 2 o 60g / L h 3 BO 3 45g / L Yttrium sulfate 1g / L Nano silica 1g / L

[0043] Electroplating process parameters: anode: metal nickel; cathode: NdFeB magnet; stirring: cathode movement; pH4.5; cathode current density: 2A / dm 2 ; Temperature: 50°C; Electroplating time: 30 minutes.

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Abstract

The present invention discloses a neodymium-iron-boron magnet nickel electroplating solution and a use method thereof, wherein a purpose of the present invention is to overcome defects of non-uniform thickness distribution and high porosity of the existing neodymium-iron-boron magnet nickel electroplating layer. The formula of the neodymium-iron-boron magnet nickel electroplating solution comprises 80-350 g / L of nickel sulfate, 20-80 g / L of nickel chloride, 30-55 g / L of boric acid, 0.1-5 g / L of yttrium sulfate, 0.04-2 g / L of nanometer silica, and the balance of water. According to the present invention, the nickel electroplating layer obtained by using the method has characteristics of uniform thickness distribution and lower porosity, and corrosion resistance of the neodymium-iron-boron magnet is improved.

Description

[0001] technical field [0002] The invention relates to the field of surface treatment of NdFeB magnetic materials, in particular to a nickel electroplating solution for NdFeB magnets and a method for using the same. Background technique [0003] In recent years, NdFeB magnetic materials have been widely used in many fields such as the electronics industry, automobiles, and communications due to their excellent magnetic properties. However, since the material is prepared by powder metallurgy process of rare earth metal neodymium, pure iron and boron, its surface is relatively loose and porous, so its chemical stability is poor, and it is prone to oxidation and rust in the use environment, and it will be damaged under hot and humid conditions. Severe electrochemical corrosion occurs, which deteriorates the magnetic properties and greatly reduces its service life. Therefore, it is extremely important to carry out strict surface protection treatment on NdFeB magnetic material...

Claims

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Application Information

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IPC IPC(8): C25D15/00C25D3/12
Inventor 徐卫红张新龙张友平
Owner 浙江东阳东磁有限公司
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